Finally I started the new engine in the car, 350, .060 over, summitracing 170 aluminium heads, comp cam 8-500-8 HR, 46mm TB and a 47mm bore 3704.

For first start up I used 16-23psi VRFP on stock 55 injectors on the same tune I used for the LO3+LT1 cam.

It pops and backfires trough the intake, doesent idle and runs "ok" if hold steady @ around 1200-2500rpm (dident go much higher).
By pressing and releasing the trottle it pops trough the intake.
Wen cranking and adding trottle it backfires (flame) trough the intake.
No fuel smell from the exhaust, almost too clean for a cold engine.

I need to get it idling so I can set the timing, for the next step, I was thinking of adding fuel and AE.

Any suggestions and help to get it running are appreciated.

 

I would connect a timing light, Leave the EST/BYPASS connected, fire up the engine, and turn the distributor (advance most likely (CCW), until it runs OK. Can go by sound and engine response.

Use the timing light to get a ball park value. May want to put some pencil marks on the damper first. Can use the WUD for the commanded timing value.

Then using the timing light turn the distributor until it is close. Remember, you are just trying to get the engine tune roughed in. Once some additional tuning is done, can then re-visit items such as the TB idle stop screw, base timing, fuel pressure and so on.

RBob.

 

I used the EBL 92caprice bin with my SA table and fueling settings and other little thinghs, turned the ditributer 1/5 CCK and it started perfect

I put 12° base timing and have around 32° SA in the main SA table, @ 500-800rpm/20-40 map.
The WUD always shows around 23° at idle and the EST code never came up ? i will have to go trough that again.

With some VE table correction and learns, added SA and 12°base timing (damper+bin), it idles and drives almost as nice as before the swap, except with 3/4 trottle from a stop the tires spinn like a

Im goin to try dctrumpets flow matched 80#/hr injectors @ around 17psi and see how it works.

 

I just found out I do not know the formula to adjust/multiply "AE - TPS PW" and the "AE - MAP PW" for different injectors.

Edit: found it

***"Affect on AE of Changing Injector Flow Rate:

Changing the injector flow rate directly affects the volume of AE fuel. This is because AE is pulse width based and is not affected by the BPC value.

The best way to compensate for a change in injector flow is to use the ratio of the old injector flow divided by the injector new flow rate. Using that ratio compensate the two AE PW tables (MAP & TPS). As an example, say that the 61 #/hr injectors are replaced with 80.5 #/hr injectors at 18 psi. The new flow rate is then 94.7 #/hr.Creating the ratio:

61 / 94.7 = 0.64

Go into your calibration editor and open the two AE PW tables. Multiply each entry by 0.64 (toolbox!). Save tables, save calibration (BIN). Done."***

So I assume 61#/hr are used in the 92 caprice bin.

80#/hr injectors @ 15psi = 85.9 #/hr

61 / 85.9 = 0.71 is the multiplicator.

 

The engine is fantastic, it has spare power, feels like driving the C5.

The 80#/hr injectors appear to be tunable for emissions @ 8-15psi VRFP, we will see.

VE learn took out alot of fuel, it idles nice in P and N but it hunts in D.

 

Idle is getting better, it had around 60 IAC, I opened the TB to get around 7 IAC.

I used the timing light again and less then 12° advance (EST disconected) it really starts running rough and hunting terribly.
Around 15° it idles nice, not sure if I should set it there, I left 12°.

 

As long as it hot cranks OK then 12* base should be OK. Be sure to set that in the calibration.

RBob.

 

Hunts in drive?

I believe there is a flag to check to lock SA during idle? I did so and then varied the SA. I ended up reducing to 17 deg.

Flag open loop idle. I did so and idle 13.8/1 OL. 800rpms/40 MAP, so if it wanders it sees same A/F.

 

"SA-Initial SA" is set to 11.95°.

I have around 32-35° SA in the "SA main table" in the 400-1000rpm/20-50 MAP. The "SA main table" does not affect idle SA wery much, I will try to add some SA in the "SA-Idle State SA" and see what happens.
Edit: just noticed "IdlSa" option is set, any disadvantage by only using the "SA main table" ?

After some repeted knock in the 4000rpm@80-90 kpa (medium uphill), I lowered SA to around 25-22°, no more Knock.
Im courious to see some SA tables used with similar aluminium heads, but first I need to finally install the EBL update.

The engine/hot or cold idle is ok, by looking at the datalog I noticed 0 IAC, I will try to set it to 5-15 steps, again.

 

That means with ESC disconnected that is you physical ADV at motor. They match right?

ID SA is set so your logs will show idle at whatever value you placed there. your SA at idle will not wander then. Might want to set fuel VE table at same value arounf rpm/map you idle at. That will help stable idle.

Seems like a lot of SA. You may only see that cell in deacceleration to a stop. I am not sure on that.

I have Edel alum 64 cc heads. I used stock FBody SA values when I started tuning. I have since added some SA but not a lot. I think I cruise at <30SA and max SA is 36. I would need to check PE-SA to see what is there but I will guess 25-29SA. I have no KC in PE. My KC is all mechanical noise.

 

Yes they match.

Idle is getting nice now, I'm trying to reproduce the sound of the LO3, not sure it will be possible, the 360 sounds a little more mean at the moment.

I lowered the SA back to "normal" in the 400-1000rpm/20-50 MAP and added 4° in the "SA-Idle State SA".

VE tables are good in the NB O2 tunable area.
I will test emissions these next days, my nose says it should be good, fuel efficiency did not suffer either.

Your cylinder heads could be similar https://www.thirdgen.org/forums/tech...ads-clean.html

 

Have you thought of looking at the LT1 F/Y car spark maps...They are a good start for an aluminum head street engine.

 

I did not know that, do you happen to have a screen pic of such a table?

 

Update:

Runs fantastic.

The LT1 Fbody and the EBL 1001.bin SA tables were great help.

Alu head LT1 SA table http://ultm8z.com/DIY%20Tuning.htm
(the one I'm using BDZL 1993 A4 TranAm.BIN.)

Iron head LT1 SA table https://www.thirdgen.org/forums/post...606-post3.html

Imput https://www.thirdgen.org/forums/post...97-post11.html

Summitracing recommends 36-38° SA for max power with these heads https://www.thirdgen.org/forums/tech...ads-clean.html.
I tried 40° @ 5700 rpm, still no knock. Meantime running 37°.

One little bug I need to fix, at cold outside themperatures the idle goes up and down 500-700rpms at a stop in Drive, but perfect in P.